MC33342DG [ONSEMI]
Battery Fast Charge Controllers; 电池快速充电控制器
| 型号： | MC33342DG |
| 厂家： | 
ONSEMI |
| 描述： | Battery Fast Charge Controllers |
| 文件： | 总16页 (文件大小：197K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MC33340, MC33342
Battery Fast Charge
Controllers
The MC33340 and MC33342 are monolithic control IC’s that are
specifically designed as fast charge controllers for Nickel Cadmium
(NiCd) and Nickel Metal Hydride (NiMH) batteries. These devices
feature negative slope voltage detection as the primary means for fast
charge termination. Accurate detection is ensured by an output that
momentarily interrupts the charge current for precise voltage
sampling. An additional secondary backup termination method can
be selected that consists of either a programmable time or temperature
limit. Protective features include battery over and undervoltage
detection, latched over temperature detection, and power supply input
undervoltage lockout with hysteresis. Fast charge holdoff time is the
only difference between the MC33340 and the MC33342. The
MC33340 has a typical holdoff time of 177 seconds and the
MC33342 has a typical holdoff time of 708 seconds.
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MARKING
DIAGRAMS
8
PDIP−8
P SUFFIX
CASE 626
MC3334xP
AWL
8
YYWW
1
1
8
• Negative Slope Voltage Detection with 4.0 mV Sensitivity
• Accurate Zero Current Battery Voltage Sensing
• High Noise Immunity with Synchronous VFC/Logic
• Programmable 1 to 4 Hour Fast Charge Time Limit
• Programmable Over/Undertemperature Detection
• Battery Over and Undervoltage Fast Charge Protection
• Power Supply Input Undervoltage Lockout with Hysteresis
• Operating Voltage Range of 3.25 V to 18 V
SOIC−8
NB SUFFIX
CASE 751
3334x
ALYWX
G
8
1
1
x
A
L
Y
W
G
= 0 or 2
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
• 177 seconds Fast Change Holdoff Time (MC33340)
• 708 seconds Fast Change Holdoff Time (MC33342)
• Pb−Free Packages are Available
PIN CONNECTIONS
V
V
Input
1
2
3
4
8
7
6
5
CC
sen
t1/T High
ref
V
Gate Output
sen
DC
Input
V
8
CC
Fast/Trickle Output
Gnd
t2/T
sen
Undervoltage
Lockout
t3/T Low
ref
Internal Bias
V
CC
(Top View)
Voltage to
Frequency
Converter
V
sen
1
Over
Temp
Latch
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
Ck
High
F/V
R
Over
R
S
Battery
Pack
Q
Battery
Detect
Temp
Detect
Low
Under
t1
t1/T High
ref
7
−DV Detect
Counter
Timer
V
Gate
t2/T
sen
sen
t2
6
V
Gate
sen
2
t3/T Low
ref
t3
3
5
V
Fast/
Trickle
CC
F/T
t/T
Time/
Temp Select
GND
4
This device contains 2,512 active transistors.
Figure 1. Simplified Block Diagram
©
Semiconductor Components Industries, LLC, 2005
1
Publication Order Number:
July, 2005 − Rev. 7
MC33340/D
MC33340, MC33342
MAXIMUM RATINGS (Note 1)
Rating
Symbol
Value
Unit
V
Power Supply Voltage (Pin 8)
Input Voltage Range
V
18
CC
V
Time/Temperature Select (Pins 5, 6, 7)
Battery Sense, (Note 2) (Pin 1)
V
−1.0 to V
IR(t/T)
CC
V
−1.0 to V + 0.6 or −1.0 to 10
IR(sen)
CC
V
Gate Output (Pin 2)
sen
Voltage
Current
V
I
20
50
V
mA
O(gate)
O(gate)
Fast/Trickle Output (Pin 3)
Voltage
Current
V
I
20
50
V
mA
O(F/T)
O(F/T)
Thermal Resistance, Junction−to−Air
P Suffix, DIP Plastic Package, Case 626
D Suffix, SO−8 Plastic Package, Case 751
Operating Junction Temperature
R
°C/W
q
JA
100
178
T
T
+150
°C
°C
°C
J
Operating Ambient Temperature (Note 3)
Storage Temperature
−25 to +85
−55 to +150
A
T
stg
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. This device series contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per MIL−STD−883, Method 3015
Machine Model Method 400 V
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2
MC33340, MC33342
ELECTRICAL CHARACTERISTICS (V = 6.0 V, for typical values T = 25°C, for min/max values T is the operating
CC
A
A
ambient temperature range that applies (Note 3), unless otherwise noted.)
Characteristic
BATTERY SENSE INPUT (Pin 1)
Input Sensitivity for −DV Detection
Overvoltage Threshold
Symbol
Min
Typ
Max
Unit
−DV
−
1.9
0.95
−
−4.0
2.0
1.0
10
−
2.1
1.05
−
mV
V
th
V
th(OV)
th(UV)
Undervoltage Threshold
V
mV
nA
MW
Input Bias Current
I
IB
Input Resistance
R
in
−
6.0
−
TIME/TEMPERATURE INPUTS (Pins 5, 6, 7)
Programing Inputs (V = 1.5 V)
in
−24
−
−30
1.0
−36
2.0
mA
Input Current
I
in
%
Input Current Matching
DI
in
Input Offset Voltage, Over and Under Temperature Comparators
Under Temperature Comparator Hysteresis (Pin 5)
Temperature Select Threshold
V
−
−
−
5.0
44
−
−
−
mV
mV
V
IO
V
H(T)
V
VCC −0.7
th(t/T)
INTERNAL TIMING
Internal Clock Oscillator Frequency
f
−
760
−
kHz
OSC
V
Gate Output (Pin 2)
Gate Time
t
gate
sen
−
−
33
−
−
ms
s
1.38
Gate Repetition Rate
Fast Charge Holdoff from −DV Detection
t
s
hold
MC33340
MC33342
−
−
177
708
−
−
V
GATE OUTPUT (Pin 2)
sen
Off−State Leakage Current (V = 20 V)
I
−
−
10
−
−
nA
V
O
off
Low State Saturation Voltage (I
= 10 mA)
V
1.2
sink
OL
FAST/TRICKLE OUTPUT (Pin 3)
Off−State Leakage Current (V = 20 V)
I
−
−
10
−
−
nA
V
O
off
Low State Saturation Voltage (I
= 10 mA)
V
1.0
sink
OL
UNDERVOLTAGE LOCKOUT (Pin 8)
Startup Threshold (V Increasing, T = 25°C)
V
−
3.0
3.25
−
V
V
CC
A
th(on)
th(off)
Turn−Off Threshold (V Decreasing, T = 25°C)
V
2.75
2.85
CC
A
TOTAL DEVICE (Pin 8)
Power Supply Current (Pins 5, 6, 7 Open)
Startup (V = 2.9 V)
I
mA
CC
−
−
0.65
0.61
2.0
2.0
CC
Operating (V = 6.0 V)
CC
2. Whichever voltage is lower.
3. Tested junction temperature range for the MC33340/342:
T
= −25°C
T
= +85°C
high
low
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3
MC33340, MC33342
2.10
2.00
1.90
16
V
= 6.0 V
CC
V
= 6.0 V
CC
8.0
0
1.02
1.00
0.98
−8.0
−16
−50
−25
0
25
50
75
100
125
−50
−25
0
25
50
75
100
125
T , AMBIENT TEMPERATURE (°C)
A
T , AMBIENT TEMPERATURE (°C)
A
Figure 2. Battery Sense Input Thresholds
versus Temperature
Figure 3. Oscillator Frequency
versus Temperature
0
−0.2
−0.4
−0.6
3.2
V
T
= 6.0 V
CC
= 25°C
V
= 6.0 V
CC
V
CC
A
Threshold voltage is measured with respect to V
.
2.4
1.6
CC
V
Pin 2
Gate
sen
Time mode is selected if any of
the three inputs are above the
threshold.
Fast/Trickle
Pin 3
0.8
0
Temperature mode is selected
when all three inputs are below
the threshold.
−0.8
−1.0
−50
−25
0
25
50
75
100
125
0
8.0
16
, SINK SATURATION (mA)
sink
24
32
40
T , AMBIENT TEMPERATURE (°C)
I
A
Figure 4. Temperature Select Threshold Voltage
versus Temperature
Figure 5. Saturation Voltage versus Sink Current
Vsen Gate and Fast/Trickle Outputs
3.1
3.0
1.0
0.8
0.6
T
A
= 25°C
Startup Threshold
(V Increasing)
CC
2.9
2.8
2.7
0.4
0.2
0
Minimum Operating Threshold
(V Decreasing)
CC
−50
−25
0
25
50
75
100
125
0
4.0
8.0
12
16
T , AMBIENT TEMPERATURE (°C)
A
V
, SUPPLY VOLTAGE (V)
CC
Figure 6. Undervoltage Lockout Thresholds
versus Temperature
Figure 7. Supply Current
versus Supply Voltage
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MC33340, MC33342
INTRODUCTION
Nickel Cadmium and Nickel Metal Hydride batteries
counter for detection of a negative slope in battery voltage. A
timer with three programming inputs is available to provide
backup charge termination. Alternatively, these inputs can be
used to monitor the battery pack temperature and to set the
over and undertemperature limits also for backup charge
termination.
require precise charge termination control to maximize cell
capacity and operating time while preventing overcharging.
Overcharging can result in a reduction of battery life as well
as physical harm to the end user. Since most portable
applications require the batteries to be charged rapidly, a
primary and usually a secondary or redundant charge sensing
technique is employed into the charging system. It is also
desirable to disable rapid charging if the battery voltage or
temperature is either too high or too low. In order to address
these issues, an economical and flexible fast charge controller
was developed.
The MC33340/342 contains many of the building blocks
and protection features that are employed in modern high
performance battery charger controllers that are specifically
designed for Nickel Cadmium and Nickel Metal Hydride
batteries. The device is designed to interface with either
primary or secondary side regulators for easy implementation
of a complete charging system. A representative block diagram
in a typical charging application is shown in Figure 8.
Two active low open collector outputs are provided to
interface this controller with the external charging circuit.
The first output furnishes a gating pulse that momentarily
interrupts the charge current. This allows an accurate method
of sampling the battery voltage by eliminating voltage drops
that are associated with high charge currents and wiring
resistances. Also, any noise voltages generated by the
charging circuitry are eliminated. The second output is
designed to switch the charging source between fast and
trickle modes based upon the results of voltage, time, or
temperature. These outputs normally connect directly to a
linear or switching regulator control circuit in non−isolated
primary or secondary side applications. Both outputs can be
used to drive optoisolators in primary side applications that
require galvanic isolation. Figure 9 shows the typical charge
characteristics for NiCd and NiMh batteries.
The battery voltage is monitored by the V input that
sen
internally connects to a voltage to frequency converter and
Regulator
DC
Input
MC33340 or MC33342
Undervoltage
Lockout
V
8
CC
Reg Control
Internal Bias
V
CC
R2
Voltage to
Frequency
Converter
2.9 V
V
R
sen
T
NTC
1
Over
Temp
Latch
R1
Charge
Status
Ck
High
F/V
R
Over
R
Q
S
Battery
Pack
2.0 V
1.0 V
Battery
Detect
Temp
Detect
Low
Under
t1
30 mA
t1/T High
ref
−DV Detect
Counter
Timer
7
SW1
SW3
R3
R4
30 mA
30 mA
V
Gate
sen
t2/T
6
sen
t2
V
Gate
sen
SW2
2
t3/T Low
ref
t3
5
3
Fast/
Trickle
t/T
V
CC
F/T
Time/
Temp
Select
0.7 V
Gnd
4
V
Batt
R2 + R1ꢀǒ ꢀ –ꢀ1Ǔ
V
sen
Figure 8. Typical Battery Charging Application
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MC33340, MC33342
1.6
1.5
70
60
V
max
−DV
dt
dV
T
max
1.4
1.3
1.2
1.1
1.0
50
40
30
20
10
Voltage
Temperature
Relative Pressure
40
0
80
120
160
CHARGE INPUT PERCENT OF CAPACITY
Figure 9. Typical Charge Characteristics for NiCd and NiMh Batteries
OPERATING DESCRIPTION
The MC33340/342 starts up in the fast charge mode when
resistive voltage divider. The input has an impedance of
power is applied to V . A change to the trickle mode can
approximately 6.0 MW and a maximum voltage range of
CC
occur as a result of three possible conditions. The first is if
−1.0 V to V + 0.6 V or 0 V to 10 V, whichever is lower.
CC
the V input voltage is above 2.0 V or below 1.0 V. Above
The 10 V upper limit is set by an internal zener clamp that
provides protection in the event of an electrostatic discharge.
The VFC is a charge−balanced synchronous type which
sen
2.0 V indicates that the battery pack is open or disconnected,
while below 1.0 V indicates the possibility of a shorted or
defective cell. The second condition is when the
MC33340/342 detects a fully charged battery by measuring
a negative slope in battery voltage. The MC33340/342
recognize a negative voltage slope after the preset holdoff
generates output pulses at a rate of F = V (24 kHz).
V
sen
The Sample Timer circuit provides a 95 kHz system clock
signal (SCK) to the VFC. This signal synchronizes the F
V
output to the other Sample Timer outputs used within the
time (t ) has elapsed during a fast charge cycle. This
detector. At 1.38 second intervals the V Gate output goes
hold
sen
indicates that the battery pack is fully charged. The third
condition is either due to the battery pack being out of a
programmed temperature range, or that the preset timer
period has been exceeded.
low for a 33 ms period. This output is used to momentarily
interrupt the external charging power source so that a precise
voltage measurement can be taken. As the V Gate goes
sen
low, the internal Preset control line is driven high for 11 ms.
There are three conditions that will cause the controller to
During this time, the battery voltage at the V input is
sen
return from trickle to fast charge mode. The first is if the V
allowed to stabilize and the previous F count is preloaded.
sen
V
input voltage moved to within the 1.0 to 2.0 V range from
initially being either too high or too low. The second is if the
battery pack temperature moved to within the programmed
temperature range, but only from initially being too cold.
At the Preset high−to−low transition, the Convert line goes
high for 22 ms. This gates the F pulses into the ratchet
V
counter for a comparison to the preloaded count. Since the
Convert time is derived from the same clock that controls the
Third is by cycling V off and then back on causing the
VFC, the number of F pulses is independent of the clock
CC
V
internal logic to reset. A concise description of the major
circuit blocks is given below.
frequency. If the new sample has more counts than were
preloaded, it becomes the new peak count and the cycle is
repeated 1.38 seconds later. If the new sample has two fewer
counts, a less than peak voltage event has occurred, and a
register is initialized. If two successive less than peak
voltage events occur, the −DV ‘AND’ gate output goes high
and the Fast/Trickle output is latched in a low state,
signifying that the battery pack has reached full charge
status.
Negative Slope Voltage Detection
A representative block diagram of the negative slope
voltage detector is shown in Figure 10. It includes a
Synchronous Voltage to Frequency Converter, a Sample
Timer, and a Ratchet Counter. The V pin is the input for
sen
the Voltage to Frequency Converter (VFC), and it connects
to the rechargeable battery pack terminals through a
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MC33340, MC33342
Negative slope voltage detection starts after 60 ms have
elapsed in the fast charge mode. This does not affect the
in voltage during the holdoff time and the input voltage
never rises above that last detected level, the Fast/Trickle
output will latch into a low state. The negative slope voltage
detector has a maximum resolution of 2.0 V divided by
1023 mV, or 1.955 mV per count with an uncertainty of
1.0 count. This yields a detection range of 1.955 mV to
5.865 mV. In order to obtain maximum sensing accuracy,
Fast/Trickle output until the holdoff time (t ) has elapsed
hold
during the fast charge mode. Two scenarios then exist.
Trickle mode holdoff is implemented to ignore any initial
drop in voltage that may occur when charging batteries that
have been stored for an extended time period. If the negative
slope voltage detector senses that initial drop during the
holdoff time, and the input voltage rises as the battery
charges, the Fast/Trickle output will remain open. However,
if the negative slope voltage detector senses a negative drop
the R2/R1 voltage divider must be adjusted so that the V
sen
input voltage is slightly less than 2.0 V when the battery pack
is fully charged. Voltage variations due to temperature and
cell manufacturing must be considered.
Battery Detect
Low
High UVLO
F
= V (24 kHz)
sen
V
Synchronous
Voltage to
Frequency
Converter
F/T
V
Input
sen
Ck
Rachet
Counter
−DV
Logic
Over ꢁUnder Charge
Temperature Timer
Trickle Mode
Holdoff
V
Gate
sen
SCK
95 kHz
Sample
Timer
V
Gate
sen
1.38 s
Preset
11 ms
Convert
22 ms
Rachet Counter Convert
0 to 1023 F Pulses
V
Figure 10. Negative Slope Voltage Detector
Fast Charge Timer
A programmable backup charge timer is available for fast
charge termination. The timer is activated by the Time/Temp
Temperature sensing is accomplished by placing a
negative temperature coefficient (NTC) thermistor in
thermal contact with the battery pack. The thermistor
Select comparator, and is programmed from the t1/T
connects to the t2/T input which has a 30 mA current
ref
sen
High, t2/T , and t3/T Low inputs. If one or more of these
source pull−up for developing a temperature dependent
voltage. The temperature limits are set by a resistor that
sen
ref
inputs is allowed to go above V − 0.7 V or is left open, the
CC
comparator output will switch high, indicating that the timer
feature is desired. The three inputs allow one of seven
possible fast charge time limits to be selected. The
programmable time limits, rounded to the nearest whole
minute, are shown in Table 1.
connects from the t1/T High and the t3/T Low inputs to
ref
ref
ground. Since all three inputs contain matched 30 mA
current source pull−ups, the required programming resistor
values are identical to that of the thermistor at the desired
over and under trip temperature. The temperature window
detector is composed of two comparators with a common
Over/Under Temperature Detection
input that connects to the t2/T input.
sen
A backup over/under temperature detector is available
and can be used in place of the timer for fast charge
termination. The timer is disabled by the Time/Temp Select
comparator when each of the three programming inputs are
The lower comparator senses the presence of an under
temperature condition. When the lower temperature limit is
exceeded, the charger is switched to the trickle mode. The
comparator has 44 mV of hysteresis to prevent erratic
held below V − 0.7 V.
CC
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7
MC33340, MC33342
switching between the fast and trickle modes as the lower
by removing and reconnecting the battery pack or by cycling
the power supply voltage.
If the charger does not require either the time or
temperature backup features, they can both be easily
temperature limit is crossed. The amount of temperature rise
to overcome the hysteresis is determined by the thermistor’s
rate of resistance change or sensitivity at the under
temperature trip point. The required resistance change is:
disabled. This is accomplished by biasing the t3/T Low
ref
input to a voltage greater than t2/T , and by grounding the
sen
V
H(T)
44 mV
30 mA
DR(T
³ T
) +
High
+
+ 1.46 k
t1/T High input. Under these conditions, the Time/Temp
ref
Low
I
in
Select comparator output is low, indicating that the
temperature mode is selected, and that the t2/T input is
The resistance change approximates a thermal hysteresis
of 2°C with a 10 kW thermistor operating at 0°C. The under
temperature fast charge inhibit feature can be disabled by
sen
biased within the limits of an artificial temperature window.
Charging of battery packs that are used in portable power
tool applications typically use temperature as the only
means for fast charge termination. The MC33340/342 can
be configured in this manner by constantly resetting the −DV
biasing the t3/T Low input to a voltage that is greater than
ref
that present at t2/T , and less than V − 0.7 V. Under
sen
CC
extremely cold conditions, it is possible that the thermistor
detection logic. This is accomplished by biasing the V
resistance can become too high, allowing the t2/T input
sen
sen
input to ≈1.5 V from a two resistor divider that is connected
to go above V
condition can be prevented by placing a resistor in parallel
with the thermistor. Note that the time/temperature
− 0.7 V, and activate the timer. This
CC
between the positive battery pack terminal and ground. The
V
sen
Gate output is also connected to the V input. Now,
sen
each time that the Sample Timer causes the V output to go
threshold of V
− 0.7 V is a typical value at room
sen
CC
low, the V input will be pulled below the undervoltage
threshold of 1.0 V. This causes a reset of the −DV logic every
temperature. Refer to the Electrical Characteristics table
and to Figure 4 for additional information.
sen
1.38 seconds, thus disabling detection.
The upper comparator senses the presence of an over
temperature condition. When the upper temperature limit is
exceeded, the comparator output sets the Overtemperature
Latch and the charger is switched to trickle mode. Once the
latch is set, the charger cannot be returned to fast charge,
even after the temperature falls below the limit. This feature
prevents the battery pack from being continuously
temperature cycled and overcharged. The latch can be reset
Operating Logic
The order of events in the charging process is controlled
by the logic circuitry. Each event is dependent upon the input
conditions and the chosen method of charge termination. A
table summary containing all of the possible operating
modes is shown in Table 2.
Table 1. FAST CHARGE BACKUP TERMINATION TIME/TEMPERATURE LIMIT
Programming Inputs
Backup
Time Limit
Fast Charge
(Minutes)
t3/T Low
t2/T
t1/T High
Termination
Mode
ref
sen
ref
(Pin 5)
Open
Open
Open
Open
GND
GND
GND
(Pin 6)
Open
Open
GND
GND
Open
Open
GND
(Pin 7)
Open
GND
Open
GND
Open
GND
Open
Time
Time
283
247
Time
212
Time
177
Time
141
Time
106
71
Time
Temperature
0 V to V − 0.7 V
0 V to V − 0.7 V
0 V to V − 0.7 V
Timer Disabled
CC
CC
CC
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8
MC33340, MC33342
Table 2. CONTROLLER OPERATING MODE TABLE
Input Condition
Controller Operation
V
Input Voltage:
>1.0 V and <2.0 V
The divided down battery pack voltage is within the fast charge voltage range. The charger switches
sen
from trickle to fast charge mode as V
enters this voltage range, and a reset pulse is then applied to
sen
the timer and the overtemperature latch.
>1.0 V and <2.0 V with
two consecutive −DV
events detected after the
The battery pack has reached full charge and the charger switches from fast to a latched trickle mode.
A reset pulse must be applied for the charger to switch back to the fast mode. The reset pulse occurs
when entering the 1.0 V to 2.0 V window for V
or when V rises above 3.0 V.
sen
CC
(t
)
initial holdoff period
hold
<1.0 V or >2.0 V
The divided down battery pack voltage is outside of the fast charge voltage range. The charger
switches from fast to trickle mode.
Timer Backup:
Within time limit
The timer has not exceeded the programmed limit. The charger will be in fast charge mode if V
and
sen
V
are within their respective operating limits.
CC
Beyond time limit
The timer has exceeded the programmed limit. The charger switches from fast to a latched
trickle mode.
Temperature Backup:
Within limits
The battery pack temperature is within the programmed limits. The charger will be in fast charge mode
if V and V are within their respective operating limits.
sen
CC
Below lower limit
The battery pack temperature is below the programmed lower limit. The charger will stay in trickle
mode until the lower temperature limit is exceeded. When exceeded, the charger will switch from trickle
to fast charge mode.
Above upper limit
The battery pack temperature has exceeded the programmed upper limit. The charger switches from
fast to a latched trickle mode. A reset signal must be applied and then released for the charger to
switch back to the fast charge mode. The reset pulse occurs when entering the 1.0 V to 2.0 V window
for V
or when V rises above 3.0 V.
sen
CC
Power Supply Voltage:
This is the nominal power supply operating voltage range. The charger will be in fast charge mode if
V , and temperature backup or timer backup are within their respective operating limits.
sen
V
>3.0 V and <18 V
CC
V
>0.6 V and <2.8 V
The undervoltage lockout comparator will be activated and the charger will be in trickle mode. A reset
signal is applied to the timer and over temperature latch.
CC
Testing
Under normal operating conditions, it would take
283 minutes to verify the operation of the 34 stage ripple
counter used in the timer. In order to significantly reduce the
test time, three digital switches were added to the circuitry
and are used to bypass selected divider stages. Entering each
of the test modes without requiring additional package pins
or affecting normal device operation proved to be
challenging. Refer to the timer functional block diagram in
Figure 11.
conditions, and the relatively short variable time delay
would be transparent to the user.
Switch 2 bypasses 11 divider stages to provide a 2048
times speedup of the clock. This switch is necessary for
testing the 19 stages that were bypassed when switch 1 was
enabled. Switch 2 is enabled when the V input falls below
sen
1.0 V and the t1/T High input is biased at −100 mV.
ref
Verification of the 19 stages is accomplished by measuring
a nominal propagation delay of 338.8 ms from when the V
sen
Switch 1 bypasses 19 divider stages to provide a 524,288
times speedup of the clock. This switch is enabled when the
input falls below 1.0 V, to when the F/T output changes from
a high−to−low state.
V
input falls below 1.0 V. Verification of the programmed
Switch 3 is a dual switch consisting of sections “A” and
“B”. Section “A” bypasses 5 divider stages to provide a 32
sen
fast charge time limit is accomplished by measuring the
propagation delay from when the V input falls below
times speedup of the V gate signal that is used in sampling
sen
sen
1.0 V, to when the F/T output changes from a high−to−low
state. The 71, 106, 141, 177, 212, 247 and 283 will now
correspond to 8.1, 12.1, 16.2, 20.2, 24.3, 28.3 and 32.3 ms
delays. It is possible to enter this test mode during operation
if the equivalent battery pack voltage was to fall below 1.0 V.
This will not present a problem since the device would
normally switch from fast to trickle mode under these
the battery voltage. This speedup allows faster test
verification of two successive −DV events. Section “B”
bypasses 11 divider stages to provide a 2048 speedup of the
trickle mode holdoff timer. Switches 3A and 3B are both
activated when the t1/T High input is biased at −100 mV
ref
with respect to Pin 4.
http://onsemi.com
9
MC33340, MC33342
11 ms Preset
Q
D
Q
22 ms Convert
Switch 2
Switch 3A
Normal
Test
11
2
5
2
Oscillator
760 kHz
3
6
2
3
1
5
8
2
÷2
÷2
÷2
÷2
÷2
Switch 3B
÷2
÷2
÷2
÷2
÷2
÷2
÷2
11
95 kHz
SCK to
2
Switch 1
19
Voltage to
Frequency
Converter
2
MC33340
MC33342
Holdoff Time Signal
t1/T High
ref
t2/T
Time and Test Decoder
Fast/Trickle Output
sen
t3/T Low
ref
Each test mode bypass switch is shown
in the proper position for normal charger operation.
Figure 11. Timer Functional Block Diagram
C2
0.1
R5
1.0 k
IC1 MC33340 or MC33342
V
8
CC
D3
Undervoltage
Lockout
Internal Bias
AC
Line
Input
V
1N4002
D2
CC
R2
R
10 k
NTC
Voltage to
Frequency
Converter
2.9 V
V
sen
1
LM317
IC2
Over
Temp
Latch
R1
C1
0.01
R7
2.4
Ck F/V
High
R
Over
R
S
Battery
Pack
DC
Input
I
Adj
Q
2.0 V
1.0 V
Battery
Detect
Temp
Detect
R8
220
Low
Under
t1
30 mA
t1/T High
ref
R6
1.8 k
D4
7
−DV Detect
Counter
Timer
SW1
R3
D1
Charge
Status
V
Gate
30 mA
30 mA
t2/T
6
sen
sen
t2
V
Gate
sen
SW2
2
t3/T Low
ref
t3
V
Batt
3
5
R2 + R1ꢀǒ ꢀ –ꢀ1Ǔ
SW3
R4
V
sen
Fast/
V
t/T
CC
F/T
V
) (I ꢀR8) Trickle
Adj
ref
I
+
Time/Temp
Select
chg(fast)
0.6 V
R7
V ꢀ–ꢀV
ꢀ–ꢀV
in f(D3) Batt
R5
Gnd
4
I
+
chg(trickle)
This application combines the MC33340/342 with an adjustable three terminal regulator to form an isolated secondary side battery charger. Regulator IC2
operates as a constant current source with R7 setting the fast charge level. The trickle charge level is set by R5. The R2/R1 divider should be adjusted so
that the V
input is less than 2.0 V when the batteries are fully charged. The printed circuit board shown below will accept the several TO−220 style heat-
sen
sinks for IC2 and are all manufactured by AAVID Engineering Inc.
Figure 12. Line Isolated Linear Regulator Charger
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10
MC33340, MC33342
AAVID #
q
°C/W
SA
592502B03400
593002B03400
590302B03600
24.0
14.0
9.2
2.25″
Input
Return
Charge Mode
3 2 1
Battery
Negative
MC33340
Input
R
NTC
Input
Positive
R
R
NTC
R4
C1
D1
NTC
R3
Battery
Positive
IC1
C2
Output
D2
1.70″
R2
R8
D3
IC2
R7
(Top View)
(Bottom View)
Figure 13. Printed Circuit Board and Component Layout
(Circuit of Figure 12)
UC3842 Series
V
CC
Voltage
Feedback
Input
1.0 mA
2R
R2
2
1
R
1.0 V
Error
Amplifier
R1
Current Sense
Comparator
Output/
Compensation
Gnd
5
Primary Circuitry
Isolation Boundary
Secondary Circuitry
V
Battery
OC2
OC1
MC33340 or MC33342
V
Gate
sen
V
Gate
sen
2
R3
3
Fast/
Trickle
F/T
Gnd
4
The MC33340/342 can be combined with any of the devices in the UC3842 family of current mode controllers to form a switch mode battery charger. In this
example, optocouplers OC1 and OC2 are used to provide isolated control signals to the UC3842. During battery voltage sensing, OC2 momentarily grounds
the Output/Compensation pin, effectively turning off the charger. When fast charge termination is reached, OC1 turns on, and grounds the lower side of R3.
This reduces the peak switch current threshold of the Current Sense Comparator to a programmed trickle current level. For additional converter design in-
formation, refer to the UC3842 and UC3844 device family data sheets.
Figure 14. Line Isolated Switch Mode Charger
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11
MC33340, MC33342
MC34166 or MC34167
AC
Line
Input
V
4
CC
I
Limit
+
OSC
S
R
R4
Switch
Output
Q
2
PWM
UVLO
Thermal
R2
Ref
EA
Voltage
Feedback
Input
Battery
Pack
1
Gnd
3
Compensation
5
C1
R3
R1
MC33340/342
V
Gate
sen
V
Gate
sen
2
3
Fast/
Trickle
F/T
Gnd
4
The MC33340/342 can be used to control the MC34166 or MC34167 power switching regulators to produce an economical and efficient fast charger. These
devices are capable of operating continuously in current limit with an input voltage range of 7.5 to 40 V. The typical charging current for the MC34166 and
MC34167 is 4.3 A and 6.5 A respectively. Resistors R2 and R1 are used to set the battery pack fast charge float voltage. If precise float voltage control is not
required, components R1, R2, R3 and C1 can be deleted, and Pin 1 must be grounded. The trickle current level is set by resistor R4. It is recommended that
a redundant charge termination method be employed for end user protection. This is especially true for fast charger systems. For additional converter design
information, refer to the MC34166 and MC34167 data sheets.
Figure 15. Switch Mode Fast Charger
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12
MC33340, MC33342
ORDERING INFORMATION
Device
†
Package
SO−8
Shipping
MC33340D
98 Units / Rail
2500 / Tape & Reel
1000 Units / Rail
98 Units / Rail
MC33340DG
SO−8
(Pb−Free)
MC33340DR2
SO−8
MC33340DR2G
SO−8
(Pb−Free)
MC33340P
PDIP−8
MC33340PG
PDIP−8
(Pb−Free)
MC33342D
SO−8
MC33342DG
SO−8
(Pb−Free)
MC33342DR2
SO−8
2500 / Tape & Reel
1000 Units / Rail
MC33342DR2G
SO−8
(Pb−Free)
MC33342P
PDIP−8
MC33342PG
PDIP−8
(Pb−Free)
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
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13
MC33340, MC33342
PACKAGE DIMENSIONS
PDIP−8
P SUFFIX
CASE 626−05
ISSUE L
NOTES:
1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).
8
5
3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
−B−
MILLIMETERS
DIM MIN MAX
INCHES
1
4
MIN
MAX
0.400
0.260
0.175
0.020
0.070
A
B
C
D
F
9.40
6.10
3.94
0.38
1.02
10.16 0.370
6.60 0.240
4.45 0.155
0.51 0.015
1.78 0.040
F
−A−
NOTE 2
L
G
H
J
2.54 BSC
0.100 BSC
0.76
0.20
2.92
1.27 0.030
0.30 0.008
3.43
0.050
0.012
0.135
K
L
0.115
C
7.62 BSC
0.300 BSC
M
N
−−−
0.76
10
−−−
1.01 0.030
10
0.040
_
_
J
−T−
SEATING
PLANE
N
M
D
K
G
H
M
M
M
0.13 (0.005)
T
A
B
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14
MC33340, MC33342
PACKAGE DIMENSIONS
SOIC−8 NB
CASE 751−07
ISSUE AG
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE
MOLD PROTRUSION.
−X−
A
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
8
5
4
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
6. 751−01 THRU 751−06 ARE OBSOLETE. NEW
STANDARD IS 751−07.
S
M
M
B
0.25 (0.010)
Y
1
K
−Y−
G
MILLIMETERS
DIM MIN MAX
INCHES
MIN
MAX
0.197
0.157
0.069
0.020
A
B
C
D
G
H
J
K
M
N
S
4.80
3.80
1.35
0.33
5.00 0.189
4.00 0.150
1.75 0.053
0.51 0.013
C
N X 45
_
SEATING
PLANE
−Z−
1.27 BSC
0.050 BSC
0.10 (0.004)
0.10
0.19
0.40
0
0.25 0.004
0.25 0.007
1.27 0.016
0.010
0.010
0.050
8
0.020
0.244
M
J
H
D
8
0
_
_
_
_
0.25
5.80
0.50 0.010
6.20 0.228
M
S
S
X
0.25 (0.010)
Z
Y
SOLDERING FOOTPRINT*
1.52
0.060
7.0
4.0
0.275
0.155
0.6
0.024
1.270
0.050
mm
inches
ǒ
Ǔ
SCALE 6:1
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
http://onsemi.com
15
MC33340, MC33342
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
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Phone: 81−3−5773−3850
For additional information, please contact your
local Sales Representative.
MC33340/D
相关型号：
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